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Definition of Oblique angle

Oblique angleOblique Ob*lique", a. [F., fr. L. obliquus; ob (see Ob-) +
liquis oblique; cf. licinus bent upward, Gr ? slanting.]
[Written also oblike.]
1. Not erect or perpendicular; neither parallel to, nor at
right angles from, the base; slanting; inclined.
It has a direction oblique to that of the former
motion. --Cheyne.
2. Not straightforward; indirect; obscure; hence,
disingenuous; underhand; perverse; sinister.
The love we bear our friends . . . Hath in it
certain oblique ends. --Drayton.
This mode of oblique research, when a more direct
one is denied, we find to be the only one in our
power. --De Quincey.
Then would be closed the restless, oblique eye. That
looks for evil, like a treacherous spy. --Wordworth.
3. Not direct in descent; not following the line of father
and son; collateral.
His natural affection in a direct line was strong,
in an oblique but weak. --Baker.
Oblique angle, Oblique ascension, etc. See under
Angle,Ascension, etc.
Oblique arch (Arch.), an arch whose jambs are not at right
angles with the face, and whose intrados is in consequence
askew.
Oblique bridge, a skew bridge. See under Bridge, n.
Oblique case (Gram.), any case except the nominative. See
Case, n.
Oblique circle (Projection), a circle whose plane is
oblique to the axis of the primitive plane.
Oblique fire (Mil.), a fire the direction of which is not
perpendicular to the line fired at.
Oblique flank (Fort.), that part of the curtain whence the
fire of the opposite bastion may be discovered. --Wilhelm.
Oblique leaf. (Bot.)
(a) A leaf twisted or inclined from the normal position.
(b) A leaf having one half different from the other.
Oblique line (Geom.), a line that, meeting or tending to
meet another, makes oblique angles with it.
Oblique motion (Mus.), a kind of motion or progression in
which one part ascends or descends, while the other
prolongs or repeats the same tone, as in the accompanying
example.